<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <!-- 1.导入Vue的包 -->
    <script src="./lib/vue-2.4.0.js"></script>
</head>

<body>

    <div id="app">

        <input type="button" value="获取元素" @click="getElement" ref="mybtn">

        <h3 id="myh3" ref="myh3">今天，天气太好了！！！！</h3>
        <hr>
        <login ref="mylogin"></login>
    </div>
    <script>
        var login = {
            template: '<h3>登录组件</h3>',
            data() {
                return {
                    msg: 'son msg'
                }
            },
            methods: {
                show() {
                    console.log('调用了子组件的方法')
                }
            }
        }

        var vm = new Vue({
            el: '#app',
            data: {
                msg: ''
            },
            methods: {
                getElement() {
                    //console.log(document.getElementById('myh3').innerText)
                    // ref 是英文单词 [reference] 值类型 和 引用类型 referenceError
                    //console.log(this.$refs.myh3.innerText)
                    //console.log(this.$refs.mylogin.msg)
                    this.$refs.mylogin.show()
                }
            },
            components: {
                login
            }
        });
    </script>
</body>

</html>